configure ip address on the target dm368

i am using leopard dm368 eval board. I am booting the board with EUCDK through sd card. now i want to mount the root file system on the target through NFS(network file system).So for this i need the the ip address of the target board. To configure the ip address i gave the following command from the u boot prompt on target board -

# setenv ipaddr <ipaddr>

# setenv serverip <serverip>

# setenv gatewayip <gateway>

# setenv netmask <netmask>

after giving all these command i gave saveenv and ping <serverip> from the target terminal....but still connection between the board and server has not been established...so please help me out